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Multi-Stage Pedestrian Positioning Using Filtered WiFi Scanner Data in an Urban Road Environment
Since widespread applications of wireless sensors networks, low-speed traffic positioning based on the received signal strength indicator (RSSI) from personal devices with WiFi broadcasts has attracted considerable attention. This study presents a new range-based localization method for outdoor pede...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7308838/ https://www.ncbi.nlm.nih.gov/pubmed/32521659 http://dx.doi.org/10.3390/s20113259 |
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author | Huang, Zilin Xu, Lunhui Lin, Yongjie |
author_facet | Huang, Zilin Xu, Lunhui Lin, Yongjie |
author_sort | Huang, Zilin |
collection | PubMed |
description | Since widespread applications of wireless sensors networks, low-speed traffic positioning based on the received signal strength indicator (RSSI) from personal devices with WiFi broadcasts has attracted considerable attention. This study presents a new range-based localization method for outdoor pedestrian positioning by using the combination of offline RSSI distance estimation and real-time continuous position fitting, which can achieve high-position accuracy in the urban road environment. At the offline stage, the piecewise polynomial regression model (PPRM) is proposed to formulate the Euclidean distance between the targets and WiFi scanners by replacing the common propagation model (PM). The online stage includes three procedures. Firstly, a constant velocity Kalman filter (CVKF) is developed to smooth the real-time RSSI time series and estimate the target-detector distance. Then, a least squares Taylor series expansion (LS-TSE) is developed to calculate the actual 2-dimensional coordinate with the replacement of existing trilateral localization. Thirdly, a trajectory-based technique of the unscented Kalman filter (UKF) is introduced to smooth estimated positioning points. In tests that used field scenarios from Guangzhou, China, the experiments demonstrate that the combined CVKF and PPRM can achieve the highly accurate distance estimator of <1.98 m error with the probability of 90% or larger, which outperforms the existing propagation model. In addition, the online method can achieve average positioning error of 1.67 m with the much better than classical methods. |
format | Online Article Text |
id | pubmed-7308838 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-73088382020-06-25 Multi-Stage Pedestrian Positioning Using Filtered WiFi Scanner Data in an Urban Road Environment Huang, Zilin Xu, Lunhui Lin, Yongjie Sensors (Basel) Article Since widespread applications of wireless sensors networks, low-speed traffic positioning based on the received signal strength indicator (RSSI) from personal devices with WiFi broadcasts has attracted considerable attention. This study presents a new range-based localization method for outdoor pedestrian positioning by using the combination of offline RSSI distance estimation and real-time continuous position fitting, which can achieve high-position accuracy in the urban road environment. At the offline stage, the piecewise polynomial regression model (PPRM) is proposed to formulate the Euclidean distance between the targets and WiFi scanners by replacing the common propagation model (PM). The online stage includes three procedures. Firstly, a constant velocity Kalman filter (CVKF) is developed to smooth the real-time RSSI time series and estimate the target-detector distance. Then, a least squares Taylor series expansion (LS-TSE) is developed to calculate the actual 2-dimensional coordinate with the replacement of existing trilateral localization. Thirdly, a trajectory-based technique of the unscented Kalman filter (UKF) is introduced to smooth estimated positioning points. In tests that used field scenarios from Guangzhou, China, the experiments demonstrate that the combined CVKF and PPRM can achieve the highly accurate distance estimator of <1.98 m error with the probability of 90% or larger, which outperforms the existing propagation model. In addition, the online method can achieve average positioning error of 1.67 m with the much better than classical methods. MDPI 2020-06-08 /pmc/articles/PMC7308838/ /pubmed/32521659 http://dx.doi.org/10.3390/s20113259 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Huang, Zilin Xu, Lunhui Lin, Yongjie Multi-Stage Pedestrian Positioning Using Filtered WiFi Scanner Data in an Urban Road Environment |
title | Multi-Stage Pedestrian Positioning Using Filtered WiFi Scanner Data in an Urban Road Environment |
title_full | Multi-Stage Pedestrian Positioning Using Filtered WiFi Scanner Data in an Urban Road Environment |
title_fullStr | Multi-Stage Pedestrian Positioning Using Filtered WiFi Scanner Data in an Urban Road Environment |
title_full_unstemmed | Multi-Stage Pedestrian Positioning Using Filtered WiFi Scanner Data in an Urban Road Environment |
title_short | Multi-Stage Pedestrian Positioning Using Filtered WiFi Scanner Data in an Urban Road Environment |
title_sort | multi-stage pedestrian positioning using filtered wifi scanner data in an urban road environment |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7308838/ https://www.ncbi.nlm.nih.gov/pubmed/32521659 http://dx.doi.org/10.3390/s20113259 |
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